add. ·noun a worker who replaces full bobbins by empty ones on the throstle or ring frames.
2. doffer ·noun a revolving cylinder, or a vibrating bar with teeth, in a carding machine, which doffs, or strips off, the cotton from the cards.
3. doffer ·add. ·noun a revolving cylinder, or a vibrating bar, with teeth, in a carding machine, which doffs, or strips off, the fiber from the cards.